Finding the Fourth Proportional to 72,809.82, 109,214.77 and 20,219.31

Step by Step Solution

1. Step 1: Write the proportion equation
   72,809.82 : 109,214.77 = 20,219.31 : x
2. Step 2: Convert to fraction form
   72,809.82/109,214.77 = 20,219.31/x
3. Step 3: Cross multiply
   72,809.82x = 109,214.77 × 20,219.31
4. Step 4: Simplify right side
   72,809.82x = 2,208,247,291.21
5. Step 5: Solve for x
   x = 2,208,247,291.21/72,809.82
6. Step 6: Final answer
   x = 30,328.98